Weird shaking around my body.?

Sometimes places around my body, usually on my thigh or my neck, start to randomly beat as if my heart had just jumped to that area. It's always a small area that it happens to and it's always right on an artery so I'm kind of worried that it's like blood clots or something that nature. Any... show more Sometimes places around my body, usually on my thigh or my neck, start to randomly beat as if my heart had just jumped to that area. It's always a small area that it happens to and it's always right on an artery so I'm kind of worried that it's like blood clots or something that nature. Any explanation of this would be greatly appreciated. Thanks.
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